A pin tumbler lock is among the most popular locks on earth coming from ancient Egypt. The original lock layout used a collection of single hooks, which, if locked, would avoid motion of a bolt by resting within the bolt itself. The key had been used to lift hooks from this spool allowing it to retract, which makes it the primary usage of a shear line, a significant discovery as well as the foundation for all cylinder established cleaning systems now. Early pin tumbler locks, bolts, and keys were made from wood followed by iron and brass, which were introduced later. Linus Yale Sr. and his son (founders of the Yale lock firm), modified the pin tumbler design in the mid-1800’s making it smaller and more reliable. The plan of the lock has remained almost unchanged because, besides auxiliary security features like security hooks, sidebars, side hooks, spinning, telescoping, ball bearings and hardened steel sticks or disks.
Pin tumblers are a series of pin stacks pushed down by a spring. Each stack must be suitably raised to permit pins, to separate at the shear line. After all pin stacks are separated, the plug can freely rotate and actuate the locking bolt to lock or unlock the lock. A conventional pin tumbler lock design uses the edge of the blade as the most important bitting area. Minor modifications to the positions of pin tumbler elements are the foundation for the newer pin tumbler lock designs such as dimple and axial/tubular locks. An incorrect key will not align all components correctly and as a result rotation of the plug will be blocked at the shear line.
Key pins (bottom Pins) — These are the pins which touch the key when it is entered. Key pins come in
various sizes to correspond to the different depths cuts on the key.
Driver pins (top Pins) — These are the pins placed between the key pins along with the springs. When in the resting position, the driver pins block the rotation of the plug. In more advanced pin tumbler systems, the driver pins may be sized to the inverse of the key pins to defend against decoding or comb select strikes.
Plug — The plug is the inner part of the lock which rotates upon insertion and tension of the proper key. The plug is connected to the camera to actuate the bolt mechanism when rotated.
Cylinder — The Cylinder is the outer bit of the lock which houses the top pin chambers and the plug. Driver pins and springs are trapped in the cylinder’s pin chambers when the proper key is used and the plug rotated.
Cam — The cam is an extension connected to the back of the plug which actuates the bolt mechanism to lock or unlock the lock.
Springs — The Springs placed above the pin stacks push down the pins to their resting position to make sure they can’t be trapped above the shear line while the plug is at the default position.
Pin tumblers are vulnerable to a wide variety of attacks. Most are exposed to a range of lockpicking techniques, pick guns, bulge keys, comb picks, impressioning, decoding, skip and destructive entry. But many times this sort of lock can be combined with other locking systems for added protection.
Traditional dimple locks are functionally equivalent to Pin-tumblers and are called for the cuts onto the bitting region that resemble dimples. They look more complicated than conventional pin tumbler locks. The plug rotates when dimples from the key are appropriately placed to quite a few pin tumbler piles in the shear line. The keyway is placed perpendicular to the trap piles to enable the key to be inserted in almost any orientation. Conventional pin tumblers let anywhere from six to twelve spots for a pin, in which dimple locks generally allow just two to six mph pin. Contemporary dimple locks permit the hooks to be set on either side of their key, significantly increasing the amount of pin positions available. This provides increased key control and master keying capabilities over traditional pin tumbler lock designs.
Dimple locks are utilized in a wide selection of programs from low to high safety. The more innovative systems comprise high-security features like key duplication, side hooks, telescoping hooks and axial rotation. Pick firearms have limited effectiveness against dimple locks due to the poor range of movement allowed from the dimple keyway, however, this type of lock is still vulnerable to attacks from lock picking, key bumping, comb picks, impressioning, decoding and bypass attacks. This locking method is also frequently combined with a different locking method to boost effectiveness from strikes.
Circle pin tumbler lock or radial lock, is a type of pin tumbler lock where six to eight pins are arranged in a circular pattern and the corresponding key is tubular or cylindrical in shape. They are usually considered by the general public to be safer and more resistant to choosing than standard locks. Such locks, however, can be chosen with a distinctive tubular lock pick or drilled with a hole saw drill bit. To prevent drilling, a number of these locks have a middle pin made of tempered steel or contain a ball bearing in the center pin.
The security of locks can be compromised in a variety of ways depending on the type of lock, the manufacturer and model and the installation and maintenance of it. If you’re considering a new lock, you may want to consult with an expert who can help you in deciding on the best system or combination of systems to address your specific needs and concerns.